If you’re shopping for some reusbable coffee filters for a Keurig (1.0 and 2.0 brewers according to the product page) then the 6-Pack Reusable Gold Plated Mesh Coffee Filters that I purchased from iParsPlusMore (via Amazon) may work well for you. The six pack was only about $10. We’ve used them several times, and haven’t had any problems with them, yet. They’re rather simple devices.
Sometimes I just want to use regular coffee grounds for a cup of coffee.